:root {
    --bg-color: #0d1117;
    --surface: #161b22;
    --border: #30363d;
    --accent: #238636; /* GitHub Green */
    --text: #c9d1d9;
    --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

body {
    background-color: var(--bg-color);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    width: 600px;
    text-align: center;
    padding: 20px;
}

/* --- CONTROLS & MODES --- */
.controls {
    margin-bottom: 20px;
    text-align: left;
}

.mode-switch {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.mode-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 12px;
    cursor: pointer;
    font-family: var(--mono);
    border-radius: 4px;
    transition: all 0.2s;
}

.mode-btn:hover {
    background: var(--surface);
}

.mode-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

#jobNameInput {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    background: var(--surface);
    border: 1px solid var(--border);
    color: white;
    border-radius: 4px;
    font-family: var(--mono);
}

#jobNameInput:focus {
    outline: none;
    border-color: var(--accent);
}

/* --- DROP ZONE --- */
.drop-zone {
    background: var(--surface);
    border: 2px dashed var(--border);
    border-radius: 6px;
    padding: 40px 20px;
    transition: all 0.2s;
    cursor: pointer;
}

.drop-zone.dragover {
    border-color: var(--accent);
    background: #1c2128;
}

/* --- FILE LIST (Professional Module Style) --- */
.file-list {
    margin-top: 20px;
    text-align: left;
    border-top: 1px solid var(--border);
    padding-top: 20px;
}

.file-item {
    background: #1c2128;
    border: 1px solid var(--border);
    padding: 10px 12px;
    margin-bottom: 8px;
    border-radius: 6px;
    cursor: grab;
    display: flex;
    align-items: center;
    transition: all 0.15s ease-in-out;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.file-item.dragging {
    opacity: 0.4;
    background: #000;
    border: 1px dashed #555;
    box-shadow: none;
    cursor: grabbing;
}

.file-item.drag-over {
    border: 2px solid var(--accent);
    transform: translateY(2px);
    box-shadow: 0 4px 12px rgba(35, 134, 54, 0.2);
}

/* 1. Grip Handle (Up/Down Arrows) */
.drag-handle {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    opacity: 0.6;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 15l5 5 5-5'%3E%3C/path%3E%3Cpath d='M7 9l5-5 5 5'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 16px;
    cursor: ns-resize;
}

.drag-handle:hover {
    opacity: 1;
    stroke: var(--text);
}

/* 2. File Info */
.file-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}

.file-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text);
    font-size: 14px;
}

.file-meta {
    font-family: var(--mono);
    font-size: 11px;
    color: #8b949e;
    margin-top: 2px;
}

/* 3. Delete Button (Base64 Encoded for Reliability) */
.remove-btn {
    width: 28px;
    height: 28px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 10px;
    cursor: pointer;
    transition: all 0.2s;
    background-image: url("data:image/svg+xml;base64,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");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 18px;
}

.remove-btn:hover {
    background-color: rgba(248, 81, 73, 0.15);
    background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjZjg1MTQ5IiBzdHJva2Utd2lkdGg9IjIiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCI+PHBvbHlsaW5lIHBvaW50cz0iMyA2IDUgNiAyMSA2Ij48L3BvbHlsaW5lPjxwYXRoIGQ9Ik0xOSA2djE0YTIgMiAwIDAgMS0yIDJIN2EyIDIgMCAwIDEtMi0yVjZtMyAwVjRhMiAyIDAgMCAxIDItMmg0YTIgMiAwIDAgMSAyIDJ2MiI+PC9wYXRoPjxsaW5lIHgxPSIxMCIgeTE9IjExIiB4Mj0iMTAiIHkyPSIxNyI+PC9saW5lPjxsaW5lIHgxPSIxNCIgeTE9IjExIiB4Mj0iMTQiIHkyPSIxNyI+PC9saW5lPjwvc3ZnPg==");
}

/* --- FOOTER UI --- */
.status-bar {
    margin-top: 20px;
    padding: 10px;
    background: #000;
    border: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 11px;
    color: #58a6ff;
    text-align: left;
}

.btn-merge {
    margin-top: 20px;
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    font-family: var(--mono);
    opacity: 0.5;
    pointer-events: none;
    transition: opacity 0.2s;
}

.btn-merge.ready {
    opacity: 1;
    pointer-events: auto;
}